gmanager has the best gmail manager features I have seen, and the most stable too. It just works.

So if youve got tons of gmail emails like me, Id highly recommend it. Ive tried all the gmail extensions I could find, but this is certainly the best one. It also supports multiple accounts, and your own domain name gmail accounts (gmailaccount@yourdomain.com)

Check it out, if you find something better, let me know.